[MNT] maintenance changes for AutoTBATS

[yarnabrina]

This PR adds some minor enhancements in StatsForecastAutoTBATS:

1. supports new arguments added in newer statsforecast to control box cox parameter range for automated selection
2. updates existing test parameters with use of more arguments for higher coverage
3. removes internal use of deprecated seasonal_periods parameter instead of consistent season_length parameter -> this is not a breaking change as user interface is unchanged

[fkiraly]

could you write a PR description?

[yarnabrina]

could you write a PR description?

I so wish that Github becomes smart enough to create descirption from commit messages automatically. Added now.

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Notes for reviewers:

1. I've modified the code internally so that we do not use a deprecated parameter. However I kept the user interface same to avoid deprecation. Is that okay or should I change there as well?
2. This parameter also happens to be a positional parameter in statsforecast, not positional only though. Should we consider setting a default value (1 seems generic and consistent with other estimators), or should we keep it as it is?

[fkiraly]

Thx for explaining